Mount Prospect, Illinois 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

242
FXUS63 KLOT 011056
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
556 AM CDT Mon Jun 1 2026

.KEY MESSAGES...

- Pockets of light rain early this morning may continue as
  sprinkles into this afternoon.

- Generally dry conditions are expected this week. Beyond this
  morning, our next chances for rain don`t arrive until Friday.

&&

.DISCUSSION...
Issued at 239 AM CDT Mon Jun 1 2026

Early this morning, we find some rain pushing across the CWA
north of I-80. While the rain has largely been on the lighter
side, embedded pockets of moderate rain have been observed. Some
sites have even been recording 4 to 5 mile visibilities beneath
some of the heavier showers. This rain is the result of a
shortwave upper impulse scooting overhead. Model guidance was
correct on the low level dry air tonight with ceilings between 6
and 8 kft with these showers and 10 to 15 degree surface
dewpoint spreads. However, most severely undermined the strength
of this wave and the resultant modest frontogenetic forcing
that are now allowing for this more moderate rainfall.

These showers are anticipated to continue working eastward
toward and out over the lake through early morning. The
shortwave will break down and get sheared out across the area
this morning into the afternoon. The loss of forcing and low
level dry advection after daybreak should phase out the true
shower development through the morning. However, as the wave and
associated vorticity sloshes back across the CWA during the
day, wouldn`t be surprised to see additional sprinkles around
the area into the afternoon. In the forecast, got rid of true
shower mention after early morning but maintained a slight
chance for sprinkles later into the day.

Skies will be mostly cloudy through the daytime before thinning
out and similar temps to yesterday are expected this afternoon
with highs progged in the middle and upper 70s to lower 80s in
our south and southwest CWA. A northeasterly breeze will again
bring cooler conditions to locales near the lake today.

The remnants of last week`s blocking upper high will drop south
into the region from Canada tomorrow and park surface high
pressure around the Great Lakes and Midwest through the middle
of the week, meaning rain chances are basically zilch in the
Tuesday through Thursday window. Middle 70s to lower 80s are
again forecast for tomorrow afternoon. By Wednesday, the high
will push far enough east of us to bring some mild return flow
to the area and highs are forecast in the lower and middle 80s
inland of the lakeshore. Between the high to our east and a
developing storm system over the Plains, we`ll find ourselves
locked in a southerly flow regime for late week and a high
theta-e air mass will overspread the region with highs favored
in the middle to upper 80s and dewpoints climbing back into the
60s. By Friday, that synoptic system will translate east into
the Midwest and bring a good shot at seeing some showers and
possibly thunderstorms, especially later Friday. Medium range
guidance then flips the switch on us and suggests a rather
active synoptic pattern with frequent opportunities for rain
could be in store for this weekend and early next week.

Doom

&&

.AVIATION /12Z TAFS THROUGH 18Z TUESDAY/...
Issued at 556 AM CDT Mon Jun 1 2026

An area of showers will continue to shift east of the Chicago-
area terminals this morning with lingering BKN-OVC cigs near
6-7 kft. A secondary disturbance will move across the region
later this morning/midday which could result in the development
of additional sprinkles/light showers. Chances appear fairly
low, and any potential impacts would be brief/minor. Have
refrained from additional precip mentions in the outgoing 12z
TAFs as a result.

Northeasterly winds will increase a bit this morning to around
10 kts and may receive a brief boost as well this afternoon
behind a lake breeze/weak backdoor front. Winds will ease a bit
overnight before increasing again out of the ENE/E on Tuesday.
VFR conditions are expected.

Carlaw

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...None.

&&

$$

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